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DNA Structure and Replication

DNA Structure and Replication
Which of the following is not a structural motif in DNA binding proteins?

TFIID
bZIP
zinc finger
helix-turn-helix

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DNA Structure and Replication
Which enzyme catalyzes the elongation of DNA molecules?

Helicase
DNA ligase
Primase
DNA polymerase

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DNA Structure and Replication
DNA gyrase in E. coli

adds positive supercoils to chromosomal DNA
is required only at the oriC site
performs the same function as helicase in eukaryotes
can be inhibited with antibiotics

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DNA Structure and Replication
Without telomerase, what would happen to the ends of chromosomes after each round of replication?

Chromosomes would get longer
Chromosomes would become progressively shorter
None of these
Nothing would happen

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DNA Structure and Replication
In DNA double helix, the two DNA chains are held together by

ionic bonds between the pair of bases
covalent bonds between the pair of bases
None of these
hydrogen bonds between the pair of bases

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DNA Structure and Replication
Which of these drugs bind to DNA and cuts it, producing hydroxyl radicals?

Erythromycin
Tunicamycin
Bleomycin
All of these

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